{
  "bibcode": "2021GCN.31008....1V",
  "body": "J. Vinko, A. Pal, L. Kriskovics, R. Szakats, K. Vida, Zs. Szabo\n(Konkoly Observatory, Hungary) report:\n\nWe observed the field of GRB211023A (Fermi GBM team, GCN  30958)\nwith the RC80 robotic telescope at Piszkesteto Station of Konkoly\nObservatory on 2021 Oct 25 starting at 17:46:47 UT. A series of 5x300 sec.\nframes were collected through Sloan r'- and i' bands. The optical afterglow\n(Zhirkov et al., GCN #30977;  Kann et al. GCN #30982; Hu et al. GCN #30990;\nBelkin et al. GCN #31004)\nwas detected on the stacked frames with the following magnitudes, calibrated.\nvia nearby PS1 stars:\n\nDate         UT-middle   t-T0(hr)  Exp(s)   r'(AB-mag)           i'(AB-mag)\n2021-10-25   18:07:19    53.03     5x300    20.104 +/- 0.089  19.634 +/- 0.081\n\nWe measure the flux decline power-law index as -1.43 +/- 0.03, in accord with.\nBelkin et al. (GCN #31004).",
  "circularId": 31008,
  "createdOn": 1635265109000,
  "email": "vinko@konkoly.hu",
  "subject": "GRB211023A: optical afterglow detection from Konkoly Observatory",
  "submitter": "Jozsef Vinko at Konkoly Observator  <vinko@konkoly.hu>",
  "eventId": "GRB 211023A"
}